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Bonjour
Je voudrais coder un programme avec Dev-c++ qui, apres ouverture d'une fenetre, a chaque clic de la souris dessine sur la fenetre un point et unpetit rectangle l'entourant places aux coordonnees du point cliqué.voici mon code:
#include <windows.h>
#include <iostream>
using namespace std;
HINSTANCE hinst;
POINT pt;
LRESULT CALLBACK MainWndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
HWND hwnd;
MSG msg;
WNDCLASS wc;
hinst = hinstance;
wc.style = 0 ;
wc.lpfnWndProc = MainWndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = NULL;
wc.hIcon = NULL;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = "MaWinClass";
if(!RegisterClass(&wc)) return FALSE;
hwnd = CreateWindow("MaWinClass", "Titre", WS_OVERLAPPEDWINDOW,
100,100, 400, 300,
NULL, NULL, hinstance, NULL);
if (!hwnd) return FALSE;
ShowWindow(hwnd, nCmdShow);
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
/******************************************************************************/
LRESULT CALLBACK MainWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
static HWND hEdit;
static int x,y;
switch (uMsg)
{
case WM_PAINT :
{
cout<<"PAINT x = "<<x<<" y = "<<y<<endl;//verification des coordonnees
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
SetPixel(hdc,x,y,RGB(0,0,0));
cout<<"TRACE CENTRE x = "<<x<<" y = "<<y<<endl;//verification trace
Rectangle(hdc,x-4,y-4,x+4,y+4);
cout<<"FIN TRACE x = "<<x<<" y = "<<y<<endl;//verification trace
EndPaint(hwnd,&ps);
return 0;
}
case WM_LBUTTONDOWN:
{
x=(int)LOWORD(lParam);
y=(int)HIWORD(lParam);
Sleep (500);
PostMessage(hwnd,WM_PAINT,wParam, lParam);
return 0;
}
case WM_DESTROY:
PostQuitMessage(0);
return 0;
default:
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
}
L'execution me donne la fenetre et 1/4 de rectangle aux coordonnees 0,0. Puis plus rien,comme s'il était impossible de redessiner sur la fenetre apres la premiere execution de WM_PAINT.Pourtant les points de controle que j'ai places donnent de bonx resultats.
Merci de m'aider.
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